Evidence for a Surface Exciton in KBr via Laser Desorption

Journal Article · Mon Jan 01 00:00:00 EST 2001 · Physical Review. B, Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.63.125423· OSTI ID:15001890

Beck, Kenneth M ^[1]; Joly, Alan G ^[1]; Hess, Wayne P ^[1]

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1. BATTELLE (PACIFIC NW LAB)

We demonstrate that direct photoexcitation of the KBr surface exciton leads to desorption of hyperthermal neutral bromine atoms. We have for the first time produced separately the hyperthermal and the near-thermal components of neutral halogen emission from an alkali halide. The source of hyperthermal bromine emission is attributed to decay of a surface exciton excited at photon energies below that of the bulk exciton. We further demonstrate that the frequently observed near-thermal component is derived from excitation within the bulk crystal. Our experimental data provides strong support to a theoretical emission model previously described in the literature.

• Research Organization: Pacific Northwest National Lab., Richland, WA (US)
• Sponsoring Organization: US Department of Energy (US)
• DOE Contract Number: AC06-76RL01830
• OSTI ID: 15001890
• Report Number(s): PNNL-SA-33478; KC0301020; TRN: US0400705
• Journal Information: Physical Review. B, Condensed Matter, Vol. 63, Issue 12; Other Information: PBD: 1 Jan 2001
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ATOMS
BROMINE
DECAY
DESORPTION
EXCITATION
EXCITONS
HALOGENS
HYDROXIDES
LASERS
PHOTONS